Ni-Based Alloy Powder Composition for Solidification Crack Prevention
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Solution Overview
Problem
Additive manufactured components made from gamma prime precipitation type Ni-based alloys are prone to solidification cracks, which deteriorate high-temperature creep properties.
Innovation Solution
A Ni-based alloy powder composition with specific mass percentages of Cr, Al, Mo, Nb, Ti, Zr, C, and B, formulated to satisfy the equation 150≤120Nb+650Zr+32Ti−385C≤270, and a manufacturing method using electron beam or laser beam irradiation to prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additive manufacturing is performed on gamma prime precipitation type Ni-based alloys, then complicated shapes can be manufactured with excellent high strength properties at elevated temperature, but solidification cracks may occur leading to deterioration of creep properties
Solution Approach 1:
The invention changes the chemical composition parameters of the Ni-based alloy by precisely controlling the content ranges of Cr (10-16%), Al (4-9%), Mo (1-6%), Nb (0.5-4%), Ti (0.5% or less), Zr (0.5% or less), C (0.06-0.4%), and B (0.04% or less), and by establishing a specific relational expression (150≤120Nb+650Zr+32Ti−385C≤270) among these elements. This parameter optimization prevents solidification cracks while maintaining high temperature strength properties.
2Reliability
If alloy composition is optimized to prevent cracks, then reliability is improved, but alloy design complexity increases
Solution Approach 1:
The invention establishes specific content ranges for multiple alloying elements and a relational expression connecting Nb, Zr, Ti, and C contents. This systematic parameter definition provides clear manufacturing guidelines that balance crack prevention requirements with compositional control feasibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents cracks in additive manufactured components, ensuring high-temperature creep rupture properties and maintaining structural integrity.
Implementation Method 1
irradiating the Ni-based alloy powder for additive manufacturing with an electron beam or a laser beam for melting and solidification to build a component
Implementation Method 2
irradiating the Ni-based alloy powder for additive manufacturing with an electron beam or a laser beam for melting and solidification to build a component
Implementation Method 3
there is a possibility that solidification cracks could occur in additive manufactured component of gamma prime precipitation type alloys
Data Source
AI summary
Provided are a Ni-based alloy powder for additive manufacturing, an additive manufactured component, and a manufacturing method thereof, all of which prevent development of cracks. The Ni-based alloy powder for additive manufacturing contains, in mass %, 10.0% to 16.0% of Cr, 4.0% to 9.0% of Al, 1.0% to 6.0% of Mo, 0.5% to 4.0% of Nb, 0.5% or less of Ti, 0.5% or less of Zr, 0.06% to 0.4% of C, and 0.04% or less of B with the balance being Ni and unavoidable impurities, in which 150 120Nb+650Zr+32Ti−385C 270 is satisfied.